2009
DOI: 10.1051/0004-6361/200810249
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The optical counterparts of accreting millisecond X-ray pulsars during quiescence

Abstract: Context. Eight accreting millisecond X-ray pulsars (AMXPs) are known to date. Although these systems are well studied at high energies, very little information is available for their optical/NIR counterparts. Up to now, only two of them, SAX J1808.4−3658 and IGR J00291+5934, have a secure multi-band detection of their optical counterparts in quiescence. Aims. All these systems are transient low-mass X-ray binaries. Optical and NIR observations carried out during quiescence give a unique opportunity to constrai… Show more

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Cited by 34 publications
(35 citation statements)
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“…The same behaviour during quiescence was observed on May 2004 (D'Avanzo et al 2009), suggesting that the compact object is heating the companion star. Such orbital modulated Fig.…”
Section: Optical Light Curvessupporting
confidence: 70%
See 1 more Smart Citation
“…The same behaviour during quiescence was observed on May 2004 (D'Avanzo et al 2009), suggesting that the compact object is heating the companion star. Such orbital modulated Fig.…”
Section: Optical Light Curvessupporting
confidence: 70%
“…During the outburst, an R ∼ 18.3 optical counterpart was identified, and hydrogen and helium emission lines were detected through optical spectroscopy, suggesting for a nondegenerate companion (Krauss et al 2005). The quiescent optical counterpart observed in 2004 is faint (R ∼ 22.5 and V ∼ 23.3;D'Avanzo et al 2009). The orbital phase-resolved quiescent optical light curves display a sinusoidal profile showing a maximum at the superior conjunction of the companion.…”
Section: Introductionmentioning
confidence: 97%
“…2, the companion star should be searched primarily among the objects that show variability between the two consecutive nights of NACO observations. Assuming a variation of at least 0.1 mag for the light curve of the Swift J1749.4-2807 companion star (as observed in other AMXPs, Shahbaz et al 1998;Welsh et al 2000;D'Avanzo et al 2009 and references therein), we can exclude all objects with H < 21 mag (Fig. 1).…”
Section: Discussionmentioning
confidence: 99%
“…LMXBs and, in particular, accreting millisecond pulsars (AMPs) are expected to harbour the most massive neutron stars because of the sustained accretion of matter during their long lives (van den Heuvel & Bitzaraki 1995). Unfortunately, dynamical studies are hampered by (i) the overwhelming accretion luminosity in persistent LMXBs (which swamps the donor star's spectrum) and (ii) the extreme faintness of the companion star in transient AMPs during quiescence (D'Avanzo et al 2009).…”
Section: Introductionmentioning
confidence: 99%